Finding the Fourth Proportional to 28,563.50, 42,872.96 and 13,782.83

Step by Step Solution

1. Step 1: Write the proportion equation
   28,563.50 : 42,872.96 = 13,782.83 : x
2. Step 2: Convert to fraction form
   28,563.50/42,872.96 = 13,782.83/x
3. Step 3: Cross multiply
   28,563.50x = 42,872.96 × 13,782.83
4. Step 4: Simplify right side
   28,563.50x = 590,910,539.37
5. Step 5: Solve for x
   x = 590,910,539.37/28,563.50
6. Step 6: Final answer
   x = 20,687.61